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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620e8bac3d22fa6cc1896b2265c2ca5a14aaf02ed36e066174bcf7570c0fa74f' 
  AND token = 'Kfrz4PLKqBN7LZZAg356eZCOWUjR9Rb0KVeAV/LqKxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}